Focus Categories
| Category | Abbreviation |
| Acid Deposition | ACD |
| Agriculture | AG |
| Climatological Processes | CP |
| Conservation | COV |
| Drought | DROU |
| Ecology | ECL |
| Economics | ECON |
| Education | EDU |
| Floods | FL |
| Geomorphological and Geochemical Processes | G&G |
| Groundwater | GW |
| Hydrogeochemistry | HYDGEO |
| Hydrology | HYDROL |
| Irrigation | IG |
| “Law, Institutions, and Policy” | LIP |
| Management and Planning | M&P |
| Methods | MET |
| Models | MOD |
| Nitrate Contamination | NC |
| Non-Point Pollution | NPP |
| Nutrients | NU |
| Radioactive Substances | RAD |
| Recreation | REC |
| Sediments | SED |
| Solute Transport | ST |
| Surface Water | SW |
| Toxic Substances | TS |
| Treatment | TRT |
| Wastewater | WW |
| Water Quality | WQL |
| Water Quantity | WQN |
| Water Supply | WS |
| Water Use | WU |
| Wetlands | WL |